Tang Zi-Rong, Yin Xia, Zhang Yanhui, Xu Yi-Jun
College of Chemistry and Chemical Engineering, New Campus, Fuzhou University , Fuzhou 350108, People's Republic of China.
Inorg Chem. 2013 Oct 21;52(20):11758-66. doi: 10.1021/ic4010483. Epub 2013 Sep 27.
CdS-1D titanate nanotubes (CdS/TNTs) nanocomposites have been synthesized via a facile one-step in situ hydrothermal method. The structure and properties of CdS/TNTs nanocomposites have been characterized by X-ray diffraction, UV-vis diffuse reflectance spectra, transmission electron microscopy, photoluminescence spectra, nitrogen adsorption-desorption, and electron spin resonance spectra. The results show that (i) as compared to blank-CdS, it is found that the morphology of CdS in the CdS/TNTs nanocomposites can be finely tuned by TNTs formed during the one-step in situ hydrothermal process; and (ii) the CdS/TNTs nanocomposites exhibit remarkably much higher visible light photocatalytic activity than both blank-CdS and blank-TNT toward aerobic selective oxidation of alcohols under mild conditions. Three integrative factors lead to such a drastic photoactivity enhancement for CdS/TNTs nanocomposites. The first one is the different morphology of CdS in the CdS/TNTs nanocomposites from blank-CdS. The second one is the prolonged lifetime of photogenerated electron-hole pairs from CdS in CdS/TNTs nanocomposites under visible light irradiation. The third one is the higher surface area and adsorption capacity of CdS/TNTs nanocomposites than blank-CdS. In addition, the possible reaction mechanism for photocatalytic selective oxidation of alcohols over CdS/TNTs nanocomposites has also been investigated using the radical scavengers technique. It is hoped that this work could promote further interest in fabrication of various 1D TNT-based composite materials and their application to visible-light-driven photocatalytic selective organic transformations.
硫化镉-一维钛酸盐纳米管（CdS/TNTs）纳米复合材料已通过简便的一步原位水热法合成。CdS/TNTs纳米复合材料的结构和性能通过X射线衍射、紫外可见漫反射光谱、透射电子显微镜、光致发光光谱、氮气吸附-脱附以及电子自旋共振光谱进行了表征。结果表明：（i）与空白CdS相比，发现在一步原位水热过程中形成的TNTs可以精细调节CdS/TNTs纳米复合材料中CdS的形貌；（ii）在温和条件下，CdS/TNTs纳米复合材料对醇的需氧选择性氧化表现出比空白CdS和空白TNT高得多的可见光光催化活性。有三个综合因素导致CdS/TNTs纳米复合材料的光活性大幅提高。第一个因素是CdS/TNTs纳米复合材料中CdS的形貌与空白CdS不同。第二个因素是在可见光照射下，CdS/TNTs纳米复合材料中CdS的光生电子-空穴对寿命延长。第三个因素是CdS/TNTs纳米复合材料比空白CdS具有更高的比表面积和吸附容量。此外，还使用自由基清除剂技术研究了CdS/TNTs纳米复合材料上醇的光催化选择性氧化的可能反应机理。希望这项工作能够进一步激发人们对制备各种基于一维TNT的复合材料及其在可见光驱动的光催化选择性有机转化中的应用的兴趣。
